there are a few reasons to use SEM (ads / banners )
this is not in order
- SEO takes time. SEM puts you on page 1 for the keywords till the SEO reaches high places
- SEO will not get you results for all the key words you imagine. SEO can focus on some key words and SEM will go after other key words
- not all traffic comes from search engines. your focus should be on “stealing eye balls”. here is an example:
if you are a dentist and this web site http://www.childrendentists.com/ gets a lot of quality traffic (by quality traffic i mean the same “eye balls” you want ) then you want to “steal” their eye balls by putting a banner here. this way all the web visitors will see your banner and might come to your web site.
- SEM allows you to shift potential clients. for example, if someone is looking for Coca Cola, Pepsi might put an SEM campaign to say “Pepsi is better”. even if the Pepsi web site does not say that, the banner can say that.